weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 49 
392 Hovey (E. O.). The Thirtieth Annual Meeting of the Geological 
Society of America. 
Sci. Am., vol. 84, p. 19, 1901. 
Contains brief abstract of some of the papers read. 
393 [Abstracts of papers read before the thirtieth annual meet- 
ing of the Geological Society of America.] 
Eng. and Mg. Jour., vol. 71, pp. 49-50, 1901. 
394 Geology at the fiftieth meeting of the American Association 
for the Advancement of Science. 
Eng. and Mg. Jour., vol. 72, pp. 297-298, 1901. 
Contains abstracts of papers read. 
395 Notes on the Triassic and Jurassic strata of the Black Hills 
of South Dakota and Wyoming. 
Abstract: N. Y. Acad. Sci., Annals, vol. 14, p. 152, 1901. 
396 See Whitfield (R. P.), 822. 
397 Hovey (Horace C). The lead and silver mines of Newbury 
[Massachusetts]. 
Sci. Am. Suppl., vol. 51, p. 21284, 1901. 
Contains notes on the occurrence of the minerals and the geology 
of the region. 
398 Howe (Ernest). Experiments illustrating intrusion and erosion. 
U. S. Geol. Surv., 21st Ann. Rept., Pt. Ill, pp. 291-303, pis. xlv-xlvii, 
figs. 100-102, 1901. 
Describes experiments illustrating the formation of laccoliths and the 
deformation of the invaded strata. 
399 Hubbard (George D.). [Review of " Preliminary description of 
the geology and water resources of the southern half of the 
Black Hills and adjoining regions in South Dakota and 
Wyoming" by N. H. Darton, and "The High Plains and 
their utilization" by Willard D. Johnson.] 
Jour. Geol., vol. 9, pp. 732-737, 1901. 
400 Hudson (Edward J.), Mabery (Charles H.) and. On the compo- 
sition of California petroleum. 
See Mabery (C. F.) and Hudson (E. J.), 507. 
I. 
4-ol Ingall (Elfric Drew). Section of mineral statistics and mines, 
Annual report for 1898. 
Can. Geol. Surv., new ser., vol. 11, Rept. S., L92 pp., L901. Published 
in 1900. 
Contains statistics of production and notes on the coal fields of Nova 
Scotia, Manitoba, Northwestern Territories and British Columbia, and 
on the occurrence of natural gas and oil in Ontario. 
9251— No. 203—02 4- 
